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根据断裂力学原理，运用相似理论求出断裂韧性KIC，GIC，JIC和δC之间的相似指标，然后利用正态函数的加法定理，对断裂韧性分散性进行相似计算，从而可以根据已知的断裂韧性随机信息，对难以求解或未知的其它断裂韧性参数进行可靠性分析和推断。计算实例介绍了一些实际应用。
According to the principle of fracture mechanics, the similarities between fracture toughness KIC, GIC, JIC and δC are calculated by the similarity theory. Then the similarity of fracture toughness dispersion is calculated by the addition theorem of normal function, Toughness random information, reliability analysis and inference of other fracture toughness parameters difficult to solve or unknown. The calculation example introduces some practical applications.